Question

Qual o valor de X nas equações a seguir: a) 3 + x = 0 b) 3x + 2 = 2 c) 12 – 7 + 4x = 25 d) 5x – 3x = 30 e) 4x + 10 = 45 – 3x f) 4. (2x + 3) = 20 g) 3.(2x – 4) = 2x + 12 h)5. (3x - 2) = 4.(3x + 5) .

Answer 1

a) 3 + x = 0

x = 0 - 3

x = - 3

b) 3x + 2 = 2

3x = 2 - 2

3x = 0

x = 0 / 3

x = 0

c) 12 – 7 + 4x = 25

4x = 25 - 12 + 7

4x = 13 + 7

4x = 20

x = 20 / 4

x = 5

d) 5x – 3x = 30

2x = 30

x = 30 / 2

x = 15

e) 4x + 10 = 45 – 3x

4x + 3x = 45 - 10

7x = 35

x = 35 / 7

x = 5

f) 4. (2x + 3) = 20

8x + 12 = 20

8x = 20 - 12

8x = 8

x = 8 / 8

x = 1

g) 3.(2x – 4) = 2x + 12

6x - 12 = 2x + 12

6x - 2x = 12 + 12

4x = 24

x = 24 / 4

x = 6

h) 5. (3x - 2) = 4.(3x + 5)

15x - 10 = 12x + 20

15x - 12x = 20 + 10

3x = 30

x = 30 / 3

x = 10